. >>> president obama made it clear today the bombings in boston are being investigated as an act of terrorism and the fbi was just as clear asking the public for help. joining me now also cnn national security analyst fran townsend, and tom fuentes. first of all, julia, what do you make of these photos the local affiliate had that show what looks like some sort of a from today, which is something that was wrapped in black and was delivered by a bag. and that sort of was the first hint they think the guy was here, the perpetrators were on-site and they dropped something. all of this seems consistent. on the other hand, it's too hard to tell, at least, from the two different slides we saw if, in fact, it was something behind the spectators and that piece sort of blew up with it. but that's the kind of information they need. what we're hearing is they have photos of say, here, and photos of here, but they don't have is right in the middle. do they have a picture of a guy dropping something or several people dropping something. that's why they're asking the public for the information an